Answer:
Sum: 22/35 Difference: -8/35
Explanation:
Because when adding and subtracting fractions you need to get common denominators you have to multiply 1/5 by 7/7 and 3/7 by 5/5.
now that both of the fractions have common denominators they can be added and subtracted very easily. you only have to worry about the numerator and keep the same denominator.
hope this helped